ENZFELDER GmbH

Power transmission

and

lifting engineering

RO

FREN Electric cylinder

ELZ

History1969 Mr. Enzfelder established a job shop in Vienna. Equipped with some machinery, the Enzfelder Company

manufactured machine parts according to drawings. Within one year the number of employees rose to 3. The Enzfelder company started manufacturing threaded spindles and nuts according to drawings. Then the range of manufacturing was enlarged by toothed wheels, screw wheels and endless screws according to drawings.

1974 The company including the complete manufacture was relocated to Enzesfeld.

1975 The manufacture of spindle gears was launched. The company’s experience in the manufacture of

trapezoid-threaded spindles, nuts, worm gear pairs and casings was a valuable basis for the construction. After many tests, the serial production of spindle gears was launched one year later. The result was a product characterized by a first-rate price-performance ratio. The product was distributed by dealers all over Europe.

1981 The planning and construction of small hydropower plants was launched to replace diesel generators.

Environmental protection was not really a topic at that time, however, and the production was stopped in 1986.

1989 The Enzfelder GesmbH company replaced the Franz Enzfelder Company.

1990 Scissor-type lifting platforms and cable winches were added to the delivery program.

1991 Resilient spacer shafts were tested and added to the production range. At the same time, the telescopic

spindle gear was developed. A patent for this principle was applied for and issued.

1993 The sale of spindle gears under their own name was launched and presented for the first time at the

Hannover industrial fair. We have been approached with a variety of tasks and have provided solutions according to the customers’ needs ever since.

1994 In cooperation with our customers we produced the first bevel gears to specification.

1995 Spindle bearing arrangements were designed and included in the standard program.

1996 The Enzfelder company produced planet gear to specification for the first time.

1998-1999 The standard programs were enlarged. Additionally, bevel gears are manufactured in a standard

design.

2000 The development of electric cylinders in standard design for very high loads (5-1000kN) was started. At the

same time the telescopic spindle gears were refined to save the customer the guiding and locking devices. Since that time we have been able to offer telescopic cylinders, too.

2001 The development of electric cylinders was completed, and these cylinders were added to the standard

program.At the same time the development and fabrication of cubic spindle gears for lifting loads between 2.5 and 150kN was started. These gears were added to the standard program as well.

2002 were extended and optimized the series of the electric cylinders. Further we provide an electronic 2D-3D

product catalogue of the spindle gears, it makes it possible to integrate our products into your system.

2002-2003 We putted our new assembling and packaging hall, beside the manufacturing hall, in operation

2003 We increased our machinery by buying a CNC machine tool with 7 axes, brand AXA. That new CNC

machine allows a precise machining of the screw jack housings in only two clamping.

2003-2004 The engineering started to use new 3-D CAD software, Solid Edge. That software enables our

customers to integrate easily our drawings.

2004 We opened a sales office in France.

2004-2005 We started to design the high performance screw jacks HSG and we created a range of 10 different

sizes.

2005 First participation to an exhibition in France: INDUSTRIE 2005 at Lyon.

2005-2006 We started to design a new range of telescopic screw jacks TSGLR. Today, these new telescopic

screw jacks, with a more compact design, are used in the stage industry, in the aircraft industry, on train lifting equipments and in machine building.

2008 We replaced the tread grinding machine by a new CNC thread grinding machine, brand Mikromat.

In the past years we solved problems of motive power engineering and lifting for our customers. We searched and found the optimal solution for each case and manufactured at the best possible price/performance ratio.

Delivery 01-2009

Page

Product information 3

Survey of construction modes with example for ordering 4

Selection of Electric cylinder with trapezoid thread spindle 5

Selection of Electric cylinder with ball bearing spindle 6

Electric cylinder type ELZ5 – ELZ350 7-15

Limit Stopp 16

Spindle noses 1-6 17

Swivelling console, Swivelling plate, Bearing console and Pivoting plate 18

Swivelling console, Swivelling plate, Bearing console and Pivoting plate 90° turned 19

Motor flanges, Crank handles and Hand wheels 20

Elastic couplings and elastic propeller shafts 21

Caculations 22

Operating and Mounting Instructions for Electric cylinders 23

Tolerances 24

Questionnaire 25

Examples for arrangements 26

FREN Electric cylinders are an advancement of our standard program. By thought

construction is an electrical cylinder in the situation also components out to be taken up. The

lift link inside electrical cylinders is protected by the tubing system from any damage by

environmental influences and is approximately to rotate secured.

In the FREN Electric cylinder there is a robust worm gear pair driving a trapezoid thread

spindle. The gear box is made of nodular graphite cast iron 50 fit high loads and meeting high

safty standards. The worm is hardened and ground and running on tapered roller bearings.

The worm wheel is made of high-strength material which is particularly resistant to abrasion;

it is mounted between deep groove ball thrust bearings. The thrust tube consists of steel and is

outside polished and chromium plated. The spindle ends can be supplied after customer's

request also stainless.

The ELZ5 to ELZ350 line ist the worm gear alternatively filled with grease or oil and the

tubing system is lubricated with grease on delivery and fit for operating temperatures ranging

between -30°C and +80°C. To be increased the trapezoid thread spindle is the life span

additionally coated with lubricating varnish by better fail-safe characteristics to be achieved

and thus.The operating factor at maximum load is 20% per hour 30% per 10 minutes.

The trapezoid thread spindles are stand single-threas double-thread three-thread and four-

thread execution. For higher demands with regard to lifting speed and operating factor we use

ball screw spindles. FREN Electric cylinders are fitted with blue prime coat (RAL 5012)

Advantages opposite hydraulic cylinders

Exact synchronism of several lifting spindles also in case of eccentric stress

Automatic lock at standstill, consequently 100% prevention of sinking after customer's

request

Synchronous actuation by motors or crank handle possible.

Precise adjustment and measuring possible

Operable in any position

Indifference to temperature over long periods

Many combinations possible thanks to standard piece parts

Large accessory assortment

High thrusts (up to 1000kN) and long strokes (up to 2500mm) feasible

No leakages

Hand wheels

Ch 1 Ch 2

type

BG 5

BG 10

BG 25

BG 50, 100

BG 100, 150

d

80

125

160

200

250

N

26

31

36

42

48

b

13,0

15,0

18,0

20,5

23,0

n

16

18

20

24

28

L

30

34

37

45

51

G

58,5

67,5

67,5

80,0

90,0

D

22

23

23

26

28

10

14

14

18

24

0,16

1,3

1,5

1,0

1,3

Weight[Kg]

BG

a F 7

b P 9

c

50

20

6

22,8

100

25

8

27,3

150

25

8

28,3

Dimensional variations according

to DIN 7168 medium.

Deviating dimensions on

request.

RPM - length -

diagramm::

1 2 4 8 1625 30/50

90

800 1000 1500 2000 3000 4000 5000

3000

2000

1500

1000

800

600

500

400

300

200

Selection chart for

sizes according to

RPM and length of

joint

RPM n

(min )-1

length L

(mm)

type G

type GX

type GZ

n

n

-1

-1

max 1500 min

max 3600 min

rated torque

[Nm]

type

weight

[kg]

for 2

hubs

for 1 m

tube

max. shift

of anglepilot

drill

type G and GX type GZ

M ounting

Spindle gears w ithout swivelling equipm ent m ust be m ounted in true alignm ent on a flat

surface which m ust be so stiff that it can assum e the m axim al load without oscillations or

deform ations.

In lifting system s the spindle noses (in case of the basic type) or the traveling nuts (in case of

the traveling nut type) m ust lie level with each other before the worm s of the spindle gears are

connected.

Before the driving gear is m ounted the sense of rotation m ust be checked: in bevel gear driven

lifting system s the sense of rotation can easily be confused; the result would be faulty

m ounting and possible dam age of the installation.

Before putting it into service the electric cylinder or the lifting system should be turned by

hand once. If this requires non uniform forces the electric cylinders are m isaligned both to

each other and to the installation. Adjustm ents are necessary; the fastening screws m ust be

worked loose and the whole lifting gear m ust again be turned by hand.

O il-lubricated worm gears: the upper screwed sealing plug m ust be replaced by the vent screw

provided.

If our specifications and perform ances according to the technical instructions are nor observed

and/or the com ponents are not used as prescribed, any warranty claim s will no longer be

applicable.

M aintenance

B y electric cylinder the worm gears are filled w ith the greasing AG IP GRS M 2 and the tube

system s are filled with the greasing Klüberplex GE11-680 in the factory.

Grease the worm gear and the tube system only in the driven out condition with the

lubricating nipples at regular intervals (~ 30-50 operating hours). The intervals depend on the

given operating conditions and the duty cycle of the spindle gears. In case of doubt please set

up the lubrication plan together w ith us. After approx. 200-300 operating hours the wear of

the tube system due to the backlash of threads should be checked. The m axim al norm al

backlash of single trapezoid threads m ust not exceed 1/4 of the thread pitch. In the cases of

m ultiple threads or special threads 1/4 of P is the m axim um norm al acceptable backlash.

W hen the m axim um norm al backlash is reached, the traveling nut in the tube system m ust be

replaced. After a short run-in period all screws m ust be checked.

After approx. 500 operating hours w e recom m end cleaning gear and spindle to rem ove the

grease, checking all parts as to wear, and recharging them with new grease.

Recom m ended lubricants: Shell Darina 2, Castrol Grease M S3, BP Energrease LS-EP2.

The lubricant recom m ended can be used both for gears and spindles. If a high-grade spindle

lubricant has to be used, we recom m end Klueberplex GE 11-680.

For special conditions (e.g. higher tem peratures) we recom m end the lubricants specified in

the enclosed technical m anual.

For oil-lubricated electric cylinders please ask for a special service m anual.

If you order spare parts, the gear specifications, m arked on the type plate m ust be provided.

External dimensions

For connecting dimensions, the tolerances given in the corresponding drawings are valid. The values where no

tolerance is indicated are untoeranced dimensions.

The axial backlash of the spindle

The axial backlash of the traveling nut in the tubing system is necessary for the building-up of an adequate

lubricating film. Wear during operation will increase the axial backlash; please pay attention to our operating

and maintenance instructions.

Spindle pitch P (mm)

max. axial backlash of the threaded spindle as manufactured (mm)

max. permissible axial b acklash due to wear (mm)

60,251,5

70,261,7

80,282,0

100 ,302,5

120,323,0

160,404,0

Pitch errors of the spindle

Due to the work tolerances of the processing machines a pitch error of 0,05 to 0,075 mm per 300 mm threaded

length results in whirl thread spindles. In the practice this error has hardly any effect on the precision of the

lifting. In case of doubt please contact us.

Backlash of tooth flank

The backlash of the tooth profile between worm and wormwheel is 0,05 to 0,15 mm as manufactured. Due to

the high speed-increasing ratios the effect on the lifting motion is practically imperdeptible.

Adjustment tolerance

An adjustment tolerance around 0,1 mm can easily be achieved with one-side load direction and manual

operation. In the case of an alternation of load the above-mentioned points must be observed. For manual

operation also fixed stop motion devices can be used.

In case of a motor drive a number of additional factors must be taken into account, e.g. speed of the driving

motor, lifting load, flywheel effect, speed-reducing ratios in the piece parts, efficiency, load direction etc..

If suitable limit switches are used, which are adjusted in the process of assemblage, the stop point can be

determined relatively exactly (prerequisite: constant operating conditions).

If in certain cases greater halting precision is required, braking motors or motor operators equipped with brakes

must be used. Fixed stroke-arresting devices are not permissible. If in certain cases running against fixed

devices is unavoidable, adequate steps must be taken to make sure that overstress is prevented (e. g. by slipping

clutch, load-controlled motor cutoff, etc.).

For further information please contact us.

FREN Spindle gear for lifting, lowering, pulling,

pushing, sluing, or rotating

Forces up to 3000kN

Lifts up to 10000mm

FREN Electric cylinders for lifting, lowering, pulling,

pushing, sluing, or rotation

Forces up to 1000kN

Lifts up to 2500mm

FREN Bevel gears ‘K’ and Bevel gears cubic ‘H’for deflecting imput shaftsSpeeds up to 6500U/minTorques up to 5200Nm

FREN Resilient cardan shafts for transmitting

torques with assembling inaccuracies

Angles up to 3°

Torques up to 500Nm

FREN Telescopic gears and telescopic cylinders

for lifting, lowering, pulling, pushing

Forces up to 1000kN

Lifts up to 10000mm

FREN Planet gears in special designs for

reducing speeds and increasing torques

Gear reduction 1,5:1 up to 1500:1

Torques up to 1000Nm

FREN Scissor-type lifting platforms for lifting and lowering

including a wide range of accessories

Forces up to 500kN

Lifts up to 5000mm

FREN Cable winches for lifting, lowering, pulling

or sluing

Forces up to 300kN

Lifts up to 100000mm

Delivery programm